Searches for CPAN authors. Arguments can be strings to be matched
exactly or regular expressions, which must be enclosed in slashes and are
matched in case-insensitive fashion. With no arguments, it returns a
list of all authors, by CPAN ID. With arguments, it returns a list of
authors if there is
more than one that matches the criteria, or it returns additional
information if a single author is returned. String and regular
expression arguments can be combined in the same command.